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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3333c6aef7c49bb5e54660a5e40daff98a182f9a1d27869123d7a5f4afe36104' 
  AND token = 'E/tWStbAqBn2RTsXPAqucE+jk1g/nL4qMsL7BNRRHTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}